Base for printing plates and a method for manufacturing same



Aug. 15, 1950 MQFRETZ BASE F0 RINTI PLATES AND A-METHOD R MANU CTURISAME Filed July 4, 45

Patented Aug. 15, 1950 :BASE .FOR PRINTING JPIJATES LAND A METHODFQB.MANUEAQIUBINGSAME fM xS tz, Zuri h, Switzerland Application July- 4,1945,5Serial Nn. 5033120 In Switzerland J annaryifi, 1M5

12 Claims.

Nowadays zany :half-tone .plate used for printingtis fitted on Woodtorleadablocks. In each case it is,ne.cessany to-treat these blocks with ablock .leveller .machine, .in :order to obtain the correct height. :woodblocks permitted the half- 7 tone plates to .-betnailed, whilst on leadblocks ithaylhad to be mounted with glue foils or the like, or withglue.

Any plates nailed upon -wood blocks have the advanta e, that the firstTmake-ready canbe inserted between -.;the plate and the block, but .woodblocks have the disadvantage of warping. .l helead blocks instead havethe advantage to pe.,,absolute ly :level, {but the-disadvantage not toJae able to insert [the .nrst make-ready between pl-ateuandrblock,sincethey are-glued together.

'lifurthermoreithe pasting of thetblock requires fi theatingefetheabloek and, a-subsequent pressing nf tth -mlate on :the zhlock.,Heating is .again iregllil iddid.-I;II1(D=Vthe plate from the block.

The object of the present invention is to eliminatevthe above-saiddisadvantages, by casting a material adapted to be casted around inlaidpieces f il l material. Theseiinlaid pieces consist preferably ofamateriahwhose coefiicient of expansion is at least approximately thesame as that of the material casted around them.

One preferredembodiment'of the-object of the presvent invention isrepresented schematically on itn iadibimns n tlihtiblock 4 consists ofagrateifi composed of l and 2 of the same :breadth, and with a deightgoorresponding tortilla-height. of the blocks l. "pg-he bars ii,:and 2 have notchesl-fi equally-spaced I pan thus be set intoeachiother at any 1distance, to buildupaconvenient. grate. The materialof the bars I and 2 willbe preferably pearwood, athe texture being werydense and easily dialled. .Leadis castintoithisl -grate toithe sameheight as i the .bars, building up :a solid :block of lead. A blockleveller machine levels lead and wood at the same time. A block with afine smooth surface of lead with wooden bars is therefore obtained.These blocks can be sawed to any size; without the block falling apart,due to the Wooden frame in the block. As may be seen from the upper partof the drawing, the bars I and 2 reach partly to the surface of theblock-mount. Between these visible parts, the bars disappear under thesurfaceof the lead.

Instead of wood another kind of nailable mate rial may be used, forinstance, plastic material, whilst the lead or lead alloy may besubstituted by some other metal or plastic mass.

Instead of a grate composed of crossing bars,

2 individual pieces of nailable material .may file provided, Whicharecastdntofileador into ,ajl'eaii alloy.

lnstead of leadorjlead alloy, botherralloys with a lowrmelting point mayalso be used.

What Itclaim and wish to secure by Ilniteid states .LettersPatent is:

.-A,method.for the manufacture of a baseffor printing, platescomprisingthesteps of: assembling .a lpluralityoof vbars of a nailablematerial crossin eachiotherso as to form a gratehaving a plurality ofempty. spaces eachof a configura- ,tion substantially. in the shape. ofa parallelogram,

' each-of saidfbarshavingaseries of notchesatuat least. one ,ofitssideedges, andpouring acasftali'l'e material. over said grate. so. as to.fil1.in.the\emp1j spaces .,-of .said grate including .such ,ndtche'swhereby. a solid. block otcastable materialuhaving the, main, portions,of. saidbars embedded therein is formed.

2.,Amethod for the manufacture of atbased'or printin aplates comprising(the steps .of .lassembling a ,p'lurality of .bars .of a nailable.matefidl crossingleachother so. asto, .i'ormv a. grate having aplurality of emptyspaceseach ,of a configurationsubstantially inthe.shapeofa parallelogram, eachbf said bar'ahavinga series of notchesa'tatleast one .fl'flits side ,edges, pouring ,a ,ca'stablematerialoversaidgrate .soas toAfill in the empty spaces or said grateincluding such notches ,,wlureb,yv asol idlolock-of.eastablamaterialjhavin the main porticns .of saidfbarswembedded thereinis formed, .and levelling .the "base in such a way that thesurfaces of.spaced portions of ,saidhar's .between said, notches are .flushwithatleast one surface of said .block.

3. "A method for thetmanu'facture of, a' base for printing ,platescomprising the, steps of: assembling a plurality of .barsof anailablemateridl grossing. each other. so as (to form. a grate having aplurality of empty "spaces each of a configuration substantially in theshape of a parallelogram,

each of said bars having a series of notches at its opposite side edges,and pouring a castable material over said grate so as to fill in theempty spaces of said grate including such notches whereby a solid blockof castable material having the main portions of said bars embeddedtherein is formed.

4. A method for the manufacture of a base for printing plates comprisingthe steps of: assembling a plurality of bars of a nailable materialcrossing each other so as to form a grate having a plurality of emptyspaces each of a configuration substantially in the shape of aparallelogram, each of said bars having a series of notches at its blinga plurality of bars of a nailable material crossing each other andhaving a series of notches ,at its opposite side edges by engagingpredetermined notches of said bars with each other in a manner so as toform a grate having a plurality.

of empty spaces each of a configuration substantially in the Shape of aparallelogram, and pouring a castable material over said grate so as tofill in the empty spaces of said grateincluding such notches whereby. asolid block of castable material having the main portions of said barsembedded therein is formed.

' '6. A method for the manufacture of a base for printing platescomprising the steps of: assem- 4 bling a plurality of bars .of anailable material crossing each other and having a series of notches areopposite side edges by engaging predetermined notches of said bars witheach other in a manner so as to form a grate having a plurality of,empty spaces each of a configuration substantially in the shape of aparallelogram, pouring a cfastablematerial over said grate so as to fillin the "empty spaces of said grate including such notches whereby asolid block of castable material having the'pmain portions of said barsembedded therein is formed, and levelling the base in such a way thatthe surfaces of spaced portions of said bars between said notches areflush with opposite surfaces of said block.

A base for printing plates comprising: a grate made of a plurality ofbars of nailable material connected with each other, each'of said barshaving a series of notches at at least one of its side edges, and asolid block of a cast material arranged in the empty spaces of saidgrate including such notches, the main portions of said ,barsbeingembedded in said solid block.

8, A base for printing plates comprising: a

grate made of a plurality of bars of nailable materialconnected witheach other, each of said bars having a series of notches at at least oneof its side edges, and a solid block of a cast material arranged intheempty spaces of said grate including such notches, the main portions ofsaid bars beingembedded in said solid block, and the surfaces of spacedportions of the side edges of said ,bars between-said notches beingflush with at least one surface of said block.

9. A base for printing plates comprising: a

grate made of a plurality of bars of nailable material connected witheach other, each of said bars having a series of notches at its oppositeside edges, and a solid block of a cast material arranged in the emptyspaces of said grate including such notches, the main portions of saidbars being embedded in saidsolid block.

10. A base for printing plates comprising: a grate made of a pluralityof bars of nailable material connected with each other, each of saidbars having a series of notches at its opposite side edges, and a solidblock of a cast material arranged in the empty spaces of said grateincluding such notches, the main portions of said bars being embedded insaid solid block, and the surfaces of spaced portions of the side edgesof said bars between said notches being flush with opposite surfaces ofsaid block.

11. A base for printing plates comprising: a grate made of a pluralityof bars of nailable material, each of said bars having a series ofnotches at its opposite side edges, said bars being connected with eachother by the engagement of predetermined notches with each other, and asolid block of a cast material arranged in the empty spaces of saidgrate including such notches, the main portions of said bars beingembedded in said solid block.

12. Abase for printing plates comprising: a gratemade of a plurality ofbars of nailable material, each of said bars having a series of notchesat its opposite side edges, said bars being connected with each other bythe engagement of predetermined notches with each other, and a solidblock of cast material arranged in the empty spaces of said grateincluding such notches, the main portions of said bars being embedded insaid solid block, and the surfaces of spaced portions of the side edgesof said bars between said notches being flush with opposite surfaces ofsaid block. 7

MAX FRETZ.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 360,307 Klopsch Mar. 29, 18871,928,821 Hoge June 4, 1912 1,158,852 Richardson Nov. 2, 1915 1,185,438Richardson May 30, 1916 1,530,752 Brooks Mar. 24, 1925 1,898,668 JonesFeb. 21, 1933 FOREIGN PATENTS Number Country Date 17,809 Australia Jan.12, 1929 358,651 Great Britain Oct. 15, 1931

